1×RTT and HRPD neighbor list support over LTE

• US 9,119,119 B2
• Filed: 10/20/2009
• Issued: 08/25/2015
• Est. Priority Date: 10/31/2008
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Balasubramanian, Srinivasan, Klingenbrunn, Thomas, Ramachandran, Shyamal, Swaminathan, Arvind
• Primary Examiner(s): Beyen, Zewdu A
• Application Number:
  US12/582,628
• Publication Number:
  US 20100111043A1
• Time in Patent Office: 2,135 Days
• Field of Search: 370/282, 370/329, 370/342, 370/347, 370/395.4, 370/412, 370/442, 370/469, 455/67.11, 455/67.13, 455/69, 455/12.1
• US Class Current: 1/1
• CPC Class Codes: H04W 24/00 Supervisory, monitoring or testing arrangements
• CPC Class Codes: H04W 36/0061 of neighbour cell information
• CPC Class Codes: H04W 36/14 Reselecting a network or an air interface
• CPC Class Codes: H04W 74/02 Hybrid access

Abstract

Devices and methods are provided for supporting single carrier Radio Transmission Technology (1×RTT) and High Rate Packet Data (HRPD) neighbor lists over LTE, thereby enabling efficient scans for 3GPP2 neighbors with minimal interruption to the LTE operations both when idle or when in-traffic. In one embodiment, the method may involve accessing a neighbor list, each neighboring system in the list being prioritized based at least in part on whether the access terminal (AT) supports a hybrid mode. For example, the method may involve selecting the 3GPP2 system to handin to based at least in part on the neighbor list.

Claims

1. A method by which an access terminal handles an idle transition from a first wireless communication system to a second wireless communication system, comprising:

accessing a neighbor list, each neighboring system in the neighbor list being prioritized in a preferred order based at least in part on whether the access terminal supports a hybrid mode in which the access terminal is configured to operate simultaneously in Single Carrier Radio Transmission Technology (1×

RTT) and Evolved High Rate Packet Data (eHRPD) modes, wherein the preferred order of the neighbor list prioritizes, based on types of technology of each neighboring system in the neighbor list, 1×

RTT neighbors over eHRPD neighbors and eHRPD neighbors over High Rate Packet Data (HRPD) neighbors; and

selecting the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein selecting the second wireless communication system includes;

detecting at least one 1×

RTT neighbor;

in response to the access terminal supporting the hybrid mode, comparing relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system signal quality and a 1×

RTT signal quality;

transitioning to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than a first threshold and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold;

detecting any eHRPD neighbors that are associated with the at least one 1×

RTT neighbor;

selecting one of the associated eHRPD neighbors based at least in part on relative thresholds of the associated eHRPD neighbors; and

connecting with the selected one of the associated eHRPD neighbors.

2. The method of claim 1, wherein the neighbor list comprises at least one of an eHRPD neighbor, a 1×

RTT neighbor, and a High Rate Packet Data (HRPD) neighbor.

3. The method of claim 1, wherein selecting the second wireless communication system comprises:

detecting at least one eHRPD neighbor;

in response to the access terminal not supporting the hybrid mode, comparing relative thresholds of the first wireless communication system and the at least one eHRPD neighbor against a respective one of a first wireless communication system signal quality and an eHRPD signal quality; and

transitioning to the at least one eHRPD neighbor when the first wireless communication system signal quality is lower than a first threshold of the first wireless communication system and/or the eHRPD signal quality is greater than an eHRPD threshold.

4. The method of claim 1, wherein the first wireless communication system comprises a Long Term Evolution (LTE) system and the second wireless communication system comprises a 3rd Generation Partnership Project 2 (3GPP2) system.

5. The method of claim 4, wherein selecting the second wireless communication system further comprises:

determining an absence of any detectable eHRPD neighbors; and

in response to the access terminal not supporting the hybrid mode, remaining on the first wireless communication system.

6. The method of claim 5, wherein selecting the second wireless communication system further comprises transitioning to one of an available 1×

RTT neighbor and an available HRPD neighbor when LTE coverage is no longer available.

7. The method of claim 6, wherein selecting the second wireless communication system further comprises transitioning to the 1×

RTT neighbor when an LTE signal quality is lower than an LTE threshold and/or an 1×

RTT signal quality is greater than an 1×

RTT threshold.

8. The method of claim 6, wherein selecting the second wireless communication system further comprises transitioning to the HRPD neighbor when an LTE signal quality is lower than an LTE threshold and/or an HRPD signal quality is greater than an HRPD threshold.

9. The method of claim 1, wherein selecting the second wireless communication system further comprises:

determining an absence of any detectable 1×

RTT neighbors; and

in response to the access terminal supporting the hybrid mode, scanning for at least one of an available eHRPD system and an available HRPD system to handoff to.

10. A method by which an access terminal handles an in-traffic transition from a first wireless communication system to a second wireless communication system, comprising:

accessing a neighbor list that includes a preferred order of neighboring systems that prioritizes, based on types of technology of the neighboring systems, any Evolved High Rate Packet Data (eHRPD) neighbors over any Single Carrier Radio Transmission Technology (1×

RTT) neighbors and the any 1×

RTT neighbors over any High Rate Packet Data (HRPD) neighbors; and

selecting the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein selecting the second wireless communication system includes;

determining an absence of any detectable eHRPD neighbors;

scanning for at least one 1×

RTT neighbor;

detecting the at least one 1×

RTT neighbor;

comparing relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system signal quality and an 1×

RTT signal quality; and

transitioning to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than the first threshold and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold.

11. The method of claim 10, wherein selecting the second wireless communication system comprises scanning for at least one eHRPD neighbor.

12. The method of claim 11,

wherein selecting the second wireless communication system further comprises:

detecting the at least one eHRPD neighbor;

comparing relative thresholds of the first wireless communication system and the at least one eHRPD neighbor against a respective one of a first wireless communication system signal quality and an eHRPD signal quality; and

transitioning to the at least one eHRPD neighbor when the first wireless communication system signal quality is lower than a first threshold of the first wireless communication system and/or the eHRPD signal quality is greater than an eHRPD threshold.

13. The method of claim 10, wherein selecting the second wireless communication system further comprises:

determining an absence of any detectable 1×

RTT neighbors; and

scanning for at least one HRPD neighbor.

14. A communication device for handling an idle transition of an access terminal from a first wireless communication system to a second wireless communication system, comprising:

a transceiver module;

at least one processor operatively coupled with the transceiver module; and

a memory module operatively coupled with the at least one processor and comprising executable code for the at least one processor to;

access a neighbor list, each neighboring system in the neighbor list being prioritized in a preferred order based at least in part on whether the access terminal supports a hybrid mode in which the access terminal is configured to operate simultaneously in Single Carrier Radio Transmission Technology (1×

RTT) and Evolved High Rate Packet Data (eHRPD) modes, wherein the preferred order of the neighbor list prioritizes, based on types of technology of each neighboring system in the neighbor list, 1×

RTT neighbors over eHRPD neighbors and eHRPD neighbors over High Rate Packet Data (HRPD) neighbors; and

select the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein the code for the at least one processor to select the second wireless communication system includes code for the at least one processor to;

detect at least one 1×

RTT neighbor;

in response to the access terminal supporting the hybrid mode, compare relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system signal quality and 1×

RTT signal quality;

instruct the access terminal to transition to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than a first threshold of the first wireless communication system and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold;

detect any eHRPD neighbors that are associated with the at least one 1×

RTT neighbor;

select one of the associated eHRPD neighbors based at least in part on relative thresholds of the associated eHRPD neighbors; and

instruct the access terminal to connect with the selected one of the associated eHRPD neighbors.

15. The communication device of claim 14, wherein the at least one processor:

detects at least one eHRPD neighbor;

in response to the access terminal not supporting the hybrid mode, compares relative thresholds of the first wireless communication system and the at least one eHRPD neighbor against a respective one of a first wireless communication system signal quality and an eHRPD signal quality; and

instructs the access terminal to transition to the at least one eHRPD neighbor when the first wireless communication system signal quality is lower than an first threshold of the first wireless communication system and/or the eHRPD signal quality is greater than an eHRPD threshold.

16. The communication device of claim 14, wherein the first wireless communication system comprises a Long Term Evolution (LTE) system and the second wireless communication system comprises a 3rd Generation Partnership Project 2 (3GPP2) system.

17. The communication device of claim 16, wherein the at least one processor:

determines an absence of any detectable eHRPD neighbors; and

in response to the access terminal not supporting the hybrid mode, instructs the access terminal to remain on the first wireless communication system.

18. The communication device of claim 17, wherein the at least one processor instructs the access terminal to transition to one of an available 1×

RTT neighbor and an available High Rate Packet Data (HRPD) neighbor when LTE coverage is no longer available.

19. The communication device of claim 18, wherein the at least one processor instructs the access terminal to transition to the 1×

RTT neighbor when an LTE signal quality is lower than an LTE threshold and/or an 1×

RTT signal quality is greater than an 1×

RTT threshold.

20. The communication device of claim 18, wherein the at least one processor instructs the access terminal to transition to the HRPD neighbor when an LTE signal quality is lower than an LTE threshold and/or an HRPD signal quality is greater than an HRPD threshold.

21. The communication device of claim 14, wherein the at least one processor:

determines an absence of any detectable 1×

RTT neighbors; and

in response to the access terminal supporting the hybrid mode, scans for at least one of an available eHRPD system and an available HRPD system to handoff to.

22. A communication device for handling an in-traffic transition of an access terminal from a first wireless communication system to a second wireless communication system, comprising:

a transceiver module;

at least one processor operatively coupled with the transceiver module; and

a memory module operatively coupled with the at least one processor and comprising executable code for the at least one processor to;

access a neighbor list that includes a preferred order of neighboring systems that prioritizes, based on types of technology of the neighboring systems, any Evolved High Rate Packet Data (eHRPD) neighbors over any Single Carrier Radio Transmission Technology (1×

RTT) neighbors and the any 1×

RTT neighbors over any High Rate Packet Data (HRPD) neighbors; and

select the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein the executable code for the at least one processor to select the second wireless communication system includes code for the at least one processor to;

determine an absence of any detectable eHRPD neighbors;

scan for at least one 1×

RTT neighbor;

detect the at least one 1×

RTT neighbor;

compare relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system signal quality and an 1×

RTT signal quality; and

instruct the access terminal to transition to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than the first threshold and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold.

23. The communication device of claim 22, wherein the executable code further comprises code for the at least one processor to scan for at least one eHRPD neighbor.

24. The communication device of claim 23, wherein the executable code further comprises code for the at least one processor to:

detect the at least one eHRPD neighbor;

compare relative thresholds of the first wireless communication system and the at least one eHRPD neighbor against a respective one of a first wireless communication system signal quality and an eHRPD signal quality; and

instruct an access terminal to transition to the at least one eHRPD neighbor when the first wireless communication system signal quality is lower than a first threshold of the first wireless communication system and/or the eHRPD signal quality is greater than an eHRPD threshold.

25. The communication device of claim 22, wherein the executable code further comprises code for the at least one processor to:

determine an absence of any detectable 1×

RTT neighbors; and

scan for at least one HRPD neighbor.

26. An apparatus for handling an idle transition of an access terminal from a first wireless communication system to a second wireless communication system, comprising:

a first component configured to access a neighbor list of the access terminal, each neighboring system in the neighbor list being prioritized in a preferred order based at least in part on whether the access terminal supports a hybrid mode in which the access terminal is configured to operate simultaneously in Single Carrier Radio Transmission Technology (1×

RTT) and Evolved High Rate Packet Data (eHRPD) modes, wherein the preferred order of the neighbor list prioritizes, based on types of technology of each neighboring system in the neighbor list, 1×

RTT neighbors prioritized over eHRPD neighbors and eHRPD neighbors over High Rate Packet Data (HRPD) neighbors; and

a second component configured to select the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein the second component configured to select the second wireless communication system includes;

a third component configured to;

detect at least one 1×

RTT neighbor;

in response to the access terminal supporting the hybrid mode, compare relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system signal quality and an 1×

RTT signal quality; and

instruct the access terminal to transition to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than a first threshold and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold; and

a fourth component configured to;

detect any eHRPD neighbors that are associated with the at least one 1×

RTT neighbor;

select one of the associated eHRPD neighbors based at least in part on relative thresholds of the associated eHRPD neighbors; and

instruct the access terminal to connect with the selected one of the associated eHRPD neighbors.

27. The apparatus of claim 26, wherein the second component is further configured to:

detect at least one eHRPD neighbor;

in response to the access terminal not supporting the hybrid mode, compare relative thresholds of the first wireless communication system and the at least one eHRPD neighbor against a respective one of a first wireless communication system signal quality and an eHRPD signal quality; and

instruct the access terminal to transition to the at least one eHRPD neighbor when the first wireless communication system signal quality is lower than a first threshold of the first wireless communication system and/or the eHRPD signal quality is greater than an eHRPD threshold.

28. The apparatus of claim 26, wherein the first wireless communication system comprises a Long Term Evolution (LTE) system and the second wireless communication system comprises a 3rd Generation Partnership Project 2 (3GPP2) system.

29. The apparatus of claim 28, further comprising a fifth component configured to:

determine an absence of any detectable eHRPD neighbors; and

in response to the access terminal not supporting the hybrid mode, instruct the access terminal to remain on the first wireless communication system.

30. The apparatus of claim 29, further comprising a sixth component for instructing the access terminal to transition to one of an available 1×

RTT neighbor and an available High Rate Packet Data (HRPD) neighbor when LTE coverage is no longer available.

31. The apparatus of claim 30, further comprising a seventh component for instructing the access terminal to transition to the 1×

RTT neighbor when an LTE signal quality is lower than an LTE threshold and/or an 1×

RTT signal quality is greater than an 1×

RTT threshold.

32. The apparatus of claim 30, further comprising a eighth component for instructing the access terminal to transition to the HRPD neighbor when an LTE signal quality is lower than an LTE threshold and/or an HRPD signal quality is greater than an HRPD threshold.

33. The apparatus of claim 26, wherein the first wireless communication system comprises an LTE system and the second wireless communication system comprises a 3GPP2 system.

34. The apparatus of claim 26, further comprising a fifth component configured to:

determine an absence of any detectable 1×

RTT neighbors; and

in response to the access terminal supporting the hybrid mode, scan for at least one of an available eHRPD system and an available HRPD system to handoff to.

35. An apparatus for handling an in-traffic transition of an access terminal from a first wireless communication system to a second wireless communication system, comprising:

a first component for accessing a neighbor list that includes a preferred order of neighboring systems that prioritizes, based on types of technology of the neighboring systems, any Evolved High Rate Packet Data (eHRPD) neighbors over any Single Carrier Radio Transmission Technology (1×

RTT) neighbors and the any 1×

RTT neighbors over any High Rate Packet Data (HRPD) neighbors; and

a second component for selecting the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein the second component for selecting the second wireless communication system includes;

a third component for determining an absence of any detectable eHRPD neighbors;

a fourth component for scanning for at least one 1×

RTT neighbor;

a fifth component for detecting the at least one 1×

RTT neighbor;

a sixth component for comparing relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system signal quality and an 1×

RTT signal quality; and

a seventh component for instructing the access terminal to transition to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than the first threshold and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold.

36. The apparatus of claim 35, wherein the second component is configured to scan for at least one eHRPD neighbor.

37. An apparatus for handling an idle transition of an access terminal from a first wireless communication system to a second wireless communication system, comprising:

means for accessing a neighbor list, each neighboring system in the neighbor list being prioritized in a preferred order based at least in part on whether the access terminal supports a hybrid mode in which the access terminal is configured to operate simultaneously in Single Carrier Radio Transmission Technology (1×

RTT) and Evolved High Rate Packet Data (eHRPD) modes, wherein the preferred order of the neighbor list prioritizes, based on types of technology of each neighboring system in the neighbor list, 1×

RTT neighbors over eHRPD neighbors and eHRPD neighbors over High Rate Packet Data (HRPD) neighbors; and

means for selecting the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein the means for selecting the second wireless communication system includes;

means for detecting at least one 1×

RTT neighbor;

in response to the access terminal supporting the hybrid mode, means for comparing relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system and an 1×

RTT signal quality;

means for instructing the access terminal to transition to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than a first threshold and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold;

means for detecting any eHRPD neighbors that are associated with the at least one 1×

RTT neighbor;

means for selecting one of the associated eHRPD neighbors based at least in part on relative thresholds of the associated eHRPD neighbors; and

means for instructing the access terminal to connect with the selected one of the associated eHRPD neighbors.

38. The apparatus of claim 37, wherein the means for selecting the second wireless communication system further comprises:

means for detecting at least one eHRPD neighbor;

in response to the access terminal not supporting the hybrid mode, means for comparing relative thresholds of the first wireless communication system and the at least one eHRPD neighbor against a respective one of a first wireless communication system signal quality and an eHRPD signal quality; and

means for instructing the access terminal to transition to the at least one eHRPD neighbor when the first wireless communication system signal quality is lower than a first threshold of the first wireless communication system and/or the eHRPD signal quality is greater than an eHRPD threshold.

39. The apparatus of claim 37, wherein the first wireless communication system comprises a Long Term Evolution (LTE) system and the second wireless communication system comprises a 3rd Generation Partnership Project (3GPP2) system.

40. The apparatus of claim 39, wherein the means for selecting the second wireless communication system further comprises:

means for determining an absence of any detectable eHRPD neighbors; and

in response to the access terminal not supporting the hybrid mode, means for instructing the access terminal to remain on the first wireless communication system.

41. The apparatus of claim 40, wherein the means for selecting the second wireless communication system further comprises

means for instructing the access terminal to transition to one of an available 1×

RTT neighbor and an available High Rate Packet Data (HRPD) neighbor when LTE coverage is no longer available.

42. The apparatus of claim 41, wherein the means for selecting the second wireless communication system comprises

means for instructing the access terminal to transition to the 1×

RTT neighbor when an LTE signal quality is lower than an LTE threshold and/or an 1×

RTT signal quality is greater than an 1×

RTT threshold.

43. The apparatus of claim 41, wherein the means for selecting the second wireless communication system comprises

means for instructing the access terminal to transition to the HRPD neighbor when an LTE signal quality is lower than an LTE threshold and/or an HRPD signal quality is greater than an HRPD threshold.

44. The apparatus of claim 37, wherein the first wireless communication system comprises an LTE system and the second wireless communication system comprises a 3GPP2 system.

45. The apparatus of claim 44, wherein the means for selecting the second wireless communication system comprises:

means for determining an absence of any detectable 1×

RTT neighbors; and

in response to the access terminal supporting the hybrid mode, means for scanning for at least one of an available eHRPD system and an available HRPD system to handoff to.

46. An apparatus for handling an in-traffic transition of an access terminal from a first wireless communication system to a second wireless communication system, comprising:

means for accessing a neighbor list that includes a preferred order of neighboring systems that prioritizes, based on types of technology of the neighboring systems, any Evolved High Rate Packet Data (eHRPD) neighbors over any Single Carrier Radio Transmission Technology (1×

RTT) neighbors and the any 1×

RTT neighbors over any High Rate Packet Data (HRPD) neighbors; and

means for selecting the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein the means for selecting the second wireless communication system includes;

means for determining an absence of any detectable eHRPD neighbors;

means for scanning for at least one 1×

RTT neighbor;

means for detecting the at least one 1×

RTT neighbor;

means for comparing relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system signal quality and an 1×

RTT signal quality; and

means for instructing the access terminal to transition to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than the first threshold and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold.

47. The apparatus of claim 46, further comprising means for scanning for at least one eHRPD neighbor.

48. A non-transitory computer-readable medium storing computer executable code, comprising:

in response to an access terminal attempting a an idle transition from a first wireless communication system to a second wireless communication system, code for causing a processor of the access terminal to;

access a neighbor list for the access terminal, each neighboring system in the neighbor list being prioritized in a preferred order based at least in part on whether the access terminal supports a hybrid mode in which the access terminal is configured to operate simultaneously in Single Carrier Radio Transmission Technology (1×

RTT) and Evolved High Rate Packet Data (eHRPD) modes, wherein the preferred order of the neighbor list prioritizes, based on types of technology of each neighboring system in the neighbor list, 1×

RTT neighbors over eHRPD neighbors and eHRPD neighbors over High Rate Packet Data (HRPD) neighbors; and

select the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein the code for causing the processor of the access terminal to select the second wireless communication system comprises code for causing the processor of the access terminal to;

detect at least one 1×

RTT neighbor;

in response to the access terminal supporting the hybrid mode, compare relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system and an 1×

RTT signal quality;

instruct the access terminal to transition to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than a first threshold and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold;

detect any eHRPD neighbors that are associated with the at least one 1×

RTT neighbor;

select one of the associated eHRPD neighbors based at least in part on relative thresholds of the associated eHRPD neighbors; and

instruct the access terminal to connect with the selected one of the associated eHRPD neighbors.

49. The non-transitory computer-readable medium of claim 48, further comprising code for causing the processor to:

detect at least one eHRPD neighbor;

in response to the access terminal not supporting the hybrid mode, compare relative thresholds of the first wireless communication system and the at least one eHRPD neighbor against a respective one of a first wireless communication system signal quality and an eHRPD signal quality; and

instruct the access terminal to transition to the at least one eHRPD neighbor when the first wireless communication system signal quality is lower than a first threshold of the first wireless communication system and/or the eHRPD signal quality is greater than an eHRPD threshold.

50. The non-transitory computer-readable medium computer program product of claim 48, wherein the first wireless communication system comprises a Long Term Evolution (LTE) system and the second wireless communication system comprises a 3rd Generation Partnership Project 2 (3GPP2) system.

51. A non-transitory computer-readable medium storing computer executable code, comprising:

in response to an in-traffic transition of an access terminal from a first wireless communication system to a second wireless communication system, code for causing a processor of the access terminal to access a neighbor list that includes a preferred order of neighboring systems that prioritizes, based on types of technology of the neighboring systems, any Evolved High Rate Packet Data (eHRPD) neighbors over any Single Carrier Radio Transmission Technology (1×

RTT) neighbors and the any 1×

RTT neighbors over any High Rate Packet Data (HRPD) neighbors; and

code for causing the processor to select the second wireless communication system to handoff to based at least in part on the neighbor list;

wherein the code for causing the processor to select the second wireless communication system includes;

code for causing the processor to determine an absence of any detectable eHRPD neighbors;

code for causing the processor to scan for at least one 1×

RTT neighbor;

code for causing the processor to detect the at least one 1×

RTT neighbor;

code for causing the processor to compare relative thresholds of the first wireless communication system and the at least one 1×

RTT neighbor against a respective one of a first wireless communication system signal quality and an 1×

RTT signal quality; and

code for causing the processor to instruct the access terminal to transition to the at least one 1×

RTT neighbor when the first wireless communication system signal quality is lower than the first threshold and/or the 1×

RTT signal quality is greater than an 1×

RTT threshold.

52. The non-transitory computer-readable medium of claim 51, further comprising code for causing the processor to scan for at least one eHRPD neighbor.